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Securities - Association's Investments Gross Unrealized Investment Losses and Fair Value of Association's Investments with Unrealized Losses (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Jun. 30, 2020
Less than 12 Months, Fair Value $ 21,456 $ 22,223
Less than 12 Months, Unrealized Losses (256) (117)
12 Months or More, Fair Value 2,421 2,351
12 Months or More, Unrealized Losses (17) (106)
Total Fair Value 23,877 24,574
Total, Unrealized Losses (273) (223)
Mortgage-backed Securities - GSE Residential [Member]    
Less than 12 Months, Fair Value 21,456 22,162
Less than 12 Months, Unrealized Losses (256) (116)
12 Months or More, Fair Value 2,421 2,351
12 Months or More, Unrealized Losses (17) (106)
Total Fair Value 23,877 24,513
Total, Unrealized Losses $ (273) (222)
State and Political Subdivisions [Member]    
Less than 12 Months, Fair Value   61
Less than 12 Months, Unrealized Losses   (1)
12 Months or More, Fair Value   0
12 Months or More, Unrealized Losses   0
Total Fair Value   61
Total, Unrealized Losses   $ (1)